break | 易学教程

How to break out or exit a method in Java?

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问题 The keyword break in Java can be used for breaking out of a loop or switch statement. Is there anything which can be used to break from a method? 回答1: Use the return keyword to exit from a method. public void someMethod() { //... a bunch of code ... if (someCondition()) { return; } //... otherwise do the following... } From the Java Tutorial that I linked to above: Any method declared void doesn't return a value. It does not need to contain a return statement, but it may do so. In such a case

Javascript breaking a for loop inside a callback function

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问题 I have code like the following: function test(obj) { if(//some conditon) { obj.onload(); }else{ obj.onerror(); } } for(var i=0;i<4;i++){ test({ onload:function(e){ //some code to run }, onerror:function(e){ break; } }); } The gist is the test() function is a function to make an XHR request (it is actually an API of the Appcelerator Titanium platform so I have no control over it) and I'm looping something to call the test function. I need to break the loop on the onerror function, but I get an

break and label, “The label MyLabel is missing”

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问题 I have a code like this: if(condition1) { break MyLabel; } while(true) { //some code here MyLabel: if(condition2) break; //more code here } and I get this error: The label MyLabel is missing. What's wrong? 回答1: You can only break to a label that is on a textually enclosing statement. In your example, the label is NOT on a statement that encloses the break statement. (For what it is worth, even higher-level languages that support goto don't allow you to jump into the middle of a loop from the

How do I break out of a loop in Scala?

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How do I break out a loop? var largest=0 for(i<-999 to 1 by -1) { for (j<-i to 1 by -1) { val product=i*j if (largest>product) // I want to break out here else if(product.toString.equals(product.toString.reverse)) largest=largest max product } } How do I turn nested for loops into tail recursion? From Scala Talk at FOSDEM 2009 http://www.slideshare.net/Odersky/fosdem-2009-1013261 on the 22nd page: Break and continue Scala does not have them. Why? They are a bit imperative; better use many smaller functions Issue how to interact with closures. They are not needed! What is the explanation? You

Break long word with CSS

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I have a situation where there can be long words like 'hellowordsometext' or integer like '1234567891122' without any space in between. check this js please. http://jsfiddle.net/rzq5e/6/ how is it possible to break it in to next line after it reach the div width. what happens now is, it spans out out along with th div <div>Solutionforentprise</div> What you need is word-wrap: break-word; , this property will force the non spaced string to break inside the div Demo div { width: 20px; word-wrap: break-word; } dev1234 I have found this solution my self. word-break: break-all; but it doesn't work

How to break nested loops in JavaScript?

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I tried this: for(i = 0; i < 5; i++){ for(j = i + 1; j < 5; j++){ break(2); } alert(1); } only to get: SyntaxError : missing ; before statement So, how would I break a nested loop in JavaScript? Noon Silk You should be able to break to a label, like so: function foo () { dance: for(var k = 0; k < 4; k++){ for(var m = 0; m < 4; m++){ if(m == 2){ break dance; } } } } You need to name your outer loop and break that loop, rather than your inner loop - like this. outer_loop: for(i=0;i<5;i++) { for(j=i+1;j<5;j++) { break outer_loop; } alert(1); } See Aaron's. Otherwise: j=5;i=5 instead of break .

Is using a 'goto' statement bad?

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After doing some reseach on how to break through a secondary loop while (true) { // Main Loop for (int I = 0; I < 15; I++) { // Secondary loop // Do Something break; // Break main loop? } } most people recommended to call the 'goto' function Looking as the following example: while (true) { // Main Loop for (int I = 0; I < 15; I++) { // Secondary Loop // Do Something goto ContinueOn; // Breaks the main loop } } ContinueOn: However; I have often heard that the 'goto' statement is bad practice. The picture below is perfectly illustrating my point: So How bad is the goto statement really, and why?

How to break out of nested loops?

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问题 If I use a break statement, it will only break inner loop and I need to use some flag to break the outer loop. But if there are many nested loops, the code will not look good. Is there any other way to break all of the loops? (Please don\'t use goto stmt .) for(int i = 0; i < 1000; i++) { for(int j = 0; j < 1000; j++) { if(condition) { // both of the loops need to break and control will go to stmt2 } } } stmt2 回答1: Use: if (condition) { i = j = 1000; break; } 回答2: No, don't spoil the fun with

What does a semicolon do?

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问题 I got a function online to help me with my current project and it had semicolons on some of the lines. I was wondering why? Is it to break the function? def containsAny(self, strings=[]): alphabet = \'abcdefghijklmnopqrstuvwxyz0123456789\' for string in strings: for char in string: if char in alphabet: return 1; return 0; The function I got online with little modification: for string in strings: for char in string: if char in alphabet: return 1; Is the above saying the following? if char in

Difference between break and continue statement

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问题 Can anyone tell me the difference between break and continue statements? 回答1: break leaves a loop, continue jumps to the next iteration. 回答2: See Branching Statements for more details and code samples: break The break statement has two forms: labeled and unlabeled. You saw the unlabeled form in the previous discussion of the switch statement. You can also use an unlabeled break to terminate a for, while, or do-while loop [...] An unlabeled break statement terminates the innermost switch, for,